You have renamed the server running Enterprise Console and now you get an error message when trying to open Enterprise Console. The error message contains text such as:
First seen in
Enterprise Console 4.0.0
What To Do
Enterprise Console relies on the server's name for a variety of functions. Renaming the server will cause errors opening the database, communicating with endpoints and distributing updates to endpoints. If you rename your server, the only solution is to revert to the original name.